--- /dev/null
+/*
+ * blink12drcs.c:
+ * Simple sequence over the first 12 GPIO pins - LEDs
+ * Aimed at the Gertboard, but it's fairly generic.
+ * This version uses DRC totalk to the ATmega on the Gertboard
+ *
+ * Copyright (c) 2012-2013 Gordon Henderson. <projects@drogon.net>
+ ***********************************************************************
+ * This file is part of wiringPi:
+ * https://projects.drogon.net/raspberry-pi/wiringpi/
+ *
+ * wiringPi is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * wiringPi is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with wiringPi. If not, see <http://www.gnu.org/licenses/>.
+ ***********************************************************************
+ */
+
+#include <stdio.h>
+#include <wiringPi.h>
+#include <drcSerial.h>
+
+#define GERT_BASE 100
+
+static int pinMap [] =
+{
+ 0, 1, 2, 3, // Pi Native
+ GERT_BASE + 2, GERT_BASE + 3, GERT_BASE + 4, GERT_BASE + 5,
+ GERT_BASE + 6, GERT_BASE + 7, GERT_BASE + 8, GERT_BASE + 9,
+} ;
+
+// Simple sequencer data
+// Triplets of LED, On/Off and delay
+
+
+int data [] =
+{
+ 0, 1, 1,
+ 1, 1, 1,
+ 0, 0, 0, 2, 1, 1,
+ 1, 0, 0, 3, 1, 1,
+ 2, 0, 0, 4, 1, 1,
+ 3, 0, 0, 5, 1, 1,
+ 4, 0, 0, 6, 1, 1,
+ 5, 0, 0, 7, 1, 1,
+ 6, 0, 0, 8, 1, 1,
+ 7, 0, 0, 9, 1, 1,
+ 8, 0, 0, 10, 1, 1,
+ 9, 0, 0, 11, 1, 1,
+ 10, 0, 1,
+ 11, 0, 1,
+
+ 0, 0, 1, // Extra delay
+
+// Back again
+
+ 11, 1, 1,
+ 10, 1, 1,
+ 11, 0, 0, 9, 1, 1,
+ 10, 0, 0, 8, 1, 1,
+ 9, 0, 0, 7, 1, 1,
+ 8, 0, 0, 6, 1, 1,
+ 7, 0, 0, 5, 1, 1,
+ 6, 0, 0, 4, 1, 1,
+ 5, 0, 0, 3, 1, 1,
+ 4, 0, 0, 2, 1, 1,
+ 3, 0, 0, 1, 1, 1,
+ 2, 0, 0, 0, 1, 1,
+ 1, 0, 1,
+ 0, 0, 1,
+
+ 0, 0, 1, // Extra delay
+
+ 0, 9, 0, // End marker
+
+} ;
+
+
+int main (void)
+{
+ int pin ;
+ int dataPtr ;
+ int l, s, d ;
+
+ printf ("Raspberry Pi - 12-LED Sequence\n") ;
+ printf ("==============================\n") ;
+ printf ("\n") ;
+ printf ("Connect LEDs up to the first 4 Pi pins and 8 pins on the ATmega\n") ;
+ printf (" from PD2 through PB1 in that order,\n") ;
+ printf (" then sit back and watch the show!\n") ;
+
+ wiringPiSetup () ;
+ drcSetupSerial (GERT_BASE, 20, "/dev/ttyAMA0", 115200) ;
+
+ for (pin = 0 ; pin < 12 ; ++pin)
+ pinMode (pinMap [pin], OUTPUT) ;
+
+ dataPtr = 0 ;
+
+ for (;;)
+ {
+ l = data [dataPtr++] ; // LED
+ s = data [dataPtr++] ; // State
+ d = data [dataPtr++] ; // Duration (10ths)
+
+ if (s == 9) // 9 -> End Marker
+ {
+ dataPtr = 0 ;
+ continue ;
+ }
+
+ digitalWrite (pinMap [l], s) ;
+ delay (d * analogRead (GERT_BASE) / 4) ;
+ }
+
+ return 0 ;
+}
--- /dev/null
+/*
+ * drcSerial.c:
+ * Extend wiringPi with the DRC Serial protocol (e.g. to Arduino)
+ * Copyright (c) 2013 Gordon Henderson
+ ***********************************************************************
+ * This file is part of wiringPi:
+ * https://projects.drogon.net/raspberry-pi/wiringpi/
+ *
+ * wiringPi is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * wiringPi is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with wiringPi.
+ * If not, see <http://www.gnu.org/licenses/>.
+ ***********************************************************************
+ */
+
+#include <stdio.h>
+#include <time.h>
+#include <string.h>
+#include <errno.h>
+
+#include "wiringPi.h"
+#include "wiringSerial.h"
+
+#include "drcSerial.h"
+
+#ifndef TRUE
+# define TRUE (1==1)
+# define FALSE (1==2)
+#endif
+
+
+/*
+ * myPinMode:
+ * Change the pin mode on the remote DRC device
+ *********************************************************************************
+ */
+
+static void myPinMode (struct wiringPiNodeStruct *node, int pin, int mode)
+{
+ /**/ if (mode == OUTPUT)
+ serialPutchar (node->fd, 'o') ; // Input
+ else if (mode == PWM_OUTPUT)
+ serialPutchar (node->fd, 'p') ; // PWM
+ else
+ serialPutchar (node->fd, 'i') ; // Default to input
+
+ serialPutchar (node->fd, pin - node->pinBase) ;
+}
+
+
+/*
+ * myPullUpDnControl:
+ * ATmegas only have pull-up's on of off. No pull-downs.
+ *********************************************************************************
+ */
+
+static void myPullUpDnControl (struct wiringPiNodeStruct *node, int pin, int mode)
+{
+
+// Force pin into input mode
+
+ serialPutchar (node->fd, 'i' ) ;
+ serialPutchar (node->fd, pin - node->pinBase) ;
+
+ /**/ if (mode == PUD_UP)
+ {
+ serialPutchar (node->fd, '1') ;
+ serialPutchar (node->fd, pin - node->pinBase) ;
+ }
+ else if (mode == PUD_OFF)
+ {
+ serialPutchar (node->fd, '0') ;
+ serialPutchar (node->fd, pin - node->pinBase) ;
+ }
+}
+
+
+/*
+ * myDigitalWrite:
+ *********************************************************************************
+ */
+
+static void myDigitalWrite (struct wiringPiNodeStruct *node, int pin, int value)
+{
+ serialPutchar (node->fd, value == 0 ? '0' : '1') ;
+ serialPutchar (node->fd, pin - node->pinBase) ;
+}
+
+
+/*
+ * myPwmWrite:
+ *********************************************************************************
+ */
+
+static void myPwmWrite (struct wiringPiNodeStruct *node, int pin, int value)
+{
+ serialPutchar (node->fd, 'v') ;
+ serialPutchar (node->fd, pin - node->pinBase) ;
+ serialPutchar (node->fd, value & 0xFF) ;
+}
+
+
+/*
+ * myAnalogRead:
+ *********************************************************************************
+ */
+
+static int myAnalogRead (struct wiringPiNodeStruct *node, int pin)
+{
+ int vHi, vLo ;
+
+ serialPutchar (node->fd, 'a') ;
+ serialPutchar (node->fd, pin - node->pinBase) ;
+ vHi = serialGetchar (node->fd) ;
+ vLo = serialGetchar (node->fd) ;
+
+ return (vHi << 8) | vLo ;
+}
+
+
+/*
+ * myDigitalRead:
+ *********************************************************************************
+ */
+
+static int myDigitalRead (struct wiringPiNodeStruct *node, int pin)
+{
+ serialPutchar (node->fd, 'r') ; // Send read command
+ serialPutchar (node->fd, pin - node->pinBase) ;
+ return (serialGetchar (node->fd) == '0') ? 0 : 1 ;
+}
+
+
+/*
+ * drcSetup:
+ * Create a new instance of an DRC GPIO interface.
+ * Could be a variable nunber of pins here - we might not know in advance
+ * if it's an ATmega with 14 pins, or something with less or more!
+ *********************************************************************************
+ */
+
+int drcSetupSerial (const int pinBase, const int numPins, const char *device, const int baud)
+{
+ int fd ;
+ int ok, tries ;
+ time_t then ;
+ struct wiringPiNodeStruct *node ;
+
+ if ((fd = serialOpen (device, baud)) < 0)
+ return wiringPiFailure (WPI_ALMOST, "Unable to open DRC device (%s): %s", device, strerror (errno)) ;
+
+ delay (10) ; // May need longer if it's an Uno that reboots on the open...
+
+// Flush any pending input
+
+ while (serialDataAvail (fd))
+ (void)serialGetchar (fd) ;
+
+ ok = FALSE ;
+ for (tries = 1 ; (tries < 5) && (!ok) ; ++tries)
+ {
+ serialPutchar (fd, '@') ; // Ping
+ then = time (NULL) + 2 ;
+ while (time (NULL) < then)
+ if (serialDataAvail (fd))
+ {
+ if (serialGetchar (fd) == '@')
+ {
+ ok = TRUE ;
+ break ;
+ }
+ }
+ }
+
+ if (!ok)
+ {
+ serialClose (fd) ;
+ return wiringPiFailure (WPI_FATAL, "Unable to communicate with DRC serial device") ;
+ }
+
+ node = wiringPiNewNode (pinBase, numPins) ;
+
+ node->fd = fd ;
+ node->pinMode = myPinMode ;
+ node->pullUpDnControl = myPullUpDnControl ;
+ node->analogRead = myAnalogRead ;
+ node->digitalRead = myDigitalRead ;
+ node->digitalWrite = myDigitalWrite ;
+ node->pwmWrite = myPwmWrite ;
+
+ return 0 ;
+}
--- /dev/null
+/*
+ * drcSerial.h:
+ * Extend wiringPi with the DRC Serial protocol (e.g. to Arduino)
+ * Copyright (c) 2013 Gordon Henderson
+ ***********************************************************************
+ * This file is part of wiringPi:
+ * https://projects.drogon.net/raspberry-pi/wiringpi/
+ *
+ * wiringPi is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * wiringPi is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with wiringPi.
+ * If not, see <http://www.gnu.org/licenses/>.
+ ***********************************************************************
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern int drcSetupSerial (const int pinBase, const int numPins, const char *device, const int baud) ;
+
+#ifdef __cplusplus
+}
+#endif